Posso comercializar o InvoicePlane?

Por ser um Sistema OpenSource, posso comercializar de alguma forma?

Hello, please post your question in English or directly into one of the language-specific forums.

I can market the invoiceplan?

you are not allowed to sell InvoicePlane if you mean this. But you can offer professional, paid support or hosting for it but not the software itself.

See https://invoiceplane.com/license-copyright